Failure characteristics of rock-like materials with single flaws under uniaxial compression

Zhao, Cheng; Niu, Jialun; Zhang, Qingzhao; Zhao, Chunfeng; Zhou, Yimeng

doi:10.1007/s10064-018-1379-2

Cited by 63 publications

(7 citation statements)

References 44 publications

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“…According to equation (5), the theoretical curves of different models can be obtained. e comparison between the theoretical curves and the numerical simulation is shown in Figure 10.…”

Section: Constitutive Model Based On Ae Eventsmentioning

confidence: 99%

“…Aliabadian et al used 3D printing technology and digital image correlation technology, and the mechanical properties and strain field laws of rock-like materials with single and double flaws in Brazilian testing were studied [4]. Zhao et al found that the evolution of the strain field was consistent with the initiation, propagation, and coalescence of microcracks [5]. Li et al conducted uniaxial compression tests on a coal sample with a single preexisting flaw and conducted acoustic emission (AE) signal monitoring during the loading processes [6].…”

Section: Introductionmentioning

confidence: 99%

“…As an effective supplement to laboratory tests, it plays an important role in the field of rock mechanics. Zhao et al used an expanded distinct element method (EDEM) to simulate the crack propagation of a single fractured rock and found that with the change of the inclination of the fracture, the failure mode of the rock also changed accordingly [5]. Guo et al used FLAC software to simulate the changes in the displacement field in tunnels and foundation pits [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Cracking Behavior and Acoustic Emission Characteristics of Rock Containing a Single Preexisting Flaw

Luo

Lei

et al. 2021

Shock and Vibration

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The existence of flaws in brittle rocks or rock-like materials has an obvious influence on the material mechanical properties and cracking behavior of civil engineering projects. In this work, the two-dimensional particle flow code PFC2D was used to study the deformation and strength properties, failure processes, and acoustic emission (AE) characteristics of mudstone with a single preexisting flaw. First, the procedure to construct a parallel bond model is introduced. The Weibull distribution is used to reflect the mechanical heterogeneity of rocks. Then, the microscopic parameters used in PFC2D are calibrated to the macroproperties of mudstone obtained from laboratory tests under the uniaxial compression. The results indicate that the increases of the flaw inclination lead to the increasing uniaxial compressive strength and elastic modulus. In terms of microcrack evolution, the initiation, propagation, and coalescence of microcracks are closely related to the force chain. Specifically, an “X” shaped tension force chain concentrated area around the preexisting flaw is founded, which is the most prone area for microcracks to initiate. With an increase in flaw inclination, the b value of AE also shows an increasing trend. By incorporating the AE event numbers into a damage variable, this paper derives a constitutive model, which is verified by numerical results on brittle rocks with a single preexisting flaw under uniaxial compression.

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“…According to equation (5), the theoretical curves of different models can be obtained. e comparison between the theoretical curves and the numerical simulation is shown in Figure 10.…”

Section: Constitutive Model Based On Ae Eventsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cracking Behavior and Acoustic Emission Characteristics of Rock Containing a Single Preexisting Flaw

Luo

Lei

et al. 2021

Shock and Vibration

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“…In this way, the decomposition of minerals will produce a range of cracks with a broad distribution of dimensions (length and width), orientations, and shapes, which will result in a higher porosity and fractal dimension. Besides, according to the study of Yu et al [55] and Liu et al [56], crystal recrystallization facilitates crack propagation in the grain-boundary regions by enabling intergranular fracture and decohesion between mineral grains; secondly, rock is a heterogeneous body composed of different minerals, and the thermal expansion coefficients of each mineral are different at high temperature [57][58][59][60]. e inconsistency of expansion and deformation of mineral grains under relatively high temperature will cause high thermal stress in the mineral structure.…”

Section: Weakening Mechanism Of Sandstone At Real-time Highmentioning

confidence: 99%

Mode I Fracture Toughness Test and Fractal Character of Fracture Trajectory of Red Sandstone under Real-Time High Temperature

Zhang

2019

Advances in Materials Science and Engineering

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To evaluate the stability and compactness of high-temperature underground construction, it is necessary to test the fracture toughness of surrounding rock (red sandstone) under real-time high temperature. In this paper, SCB specimens recommended by the International Society for Rock Mechanics are used to measure the mode I fracture toughness of red sandstone at real-time high temperatures. Also, to reveal its fracture characteristics and fracture mechanism, the fracture morphology observation (SEM experiment), XRD experiment, mercury intrusion porosimetry testing, and fractal measurement of fracture trajectory are carried out on the red sandstone specimens at various temperatures. The results show that (1) temperature may have a significant impact on the fracture toughness and fracture characteristics of red sandstone. On the whole, the fracture toughness values decrease with the increase in temperature, while the fractal dimensions of fractal trajectories increase with the increase in temperature. (2) Temperature has a significant influence on the fracture mode of red sandstone. At relatively low temperatures (20°C–400°C), the main fracture mode is transgranular failure. At relatively high temperatures (400°C–700°C), the fracture mode is mainly intergranular failure. (3) The weakening mechanism of red sandstone is mainly due to the effect of thermal dehydration when the temperature is between 100°C and 400°C. When the temperature is between 400°C and 700°C, the weakening mechanism is mainly due to thermal cracking and the α-β phase transition of quartz.

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“…Numerous experimental and numerical studies have been performed to investigate the influencing law of the flaw size, shape, distribution, and various flaw combinations on the failure behaviors and cracking development of rock or rock-like materials. Linear flaws, such as cracks [1][2][3], fissures [4,5], joints [6][7][8], and bedding planes [9], have been extensively studied by many researchers [10][11][12][13]. Nevertheless, the research literature on the influence of pore-like flaws (i.e., circular holes, openings, and pores) on rock failure behavior is relatively limited.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and cracking behavior of porous rock models containing random circular defects under uniaxial compression

Cui

2022

Front. Phys.

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Circular defects are widely distributed in porous rock materials, and the defects greatly affect the mechanical behavior and crack evolution of rock masses. In this paper, numerical models containing random circular defects are constructed based on discrete element method. Then, the uniaxial compressions are numerically performed to reveal the influence of the porosity or size homogeneity of the defects on the mechanical behavior, crack evolution, and acoustic emission (AE) events of the models. The results suggest that a univariant increase in porosity leads to a nonlinear decrease in the peak strength and a linear decrease in the elastic modulus. The number of cracks and AE events decrease with increasing porosity. As the size homogeneity coefficient increases, the peak strengths show a slight linear rise, while the elastic modulus values show a minimal linear downward trend, and the number of cracks and AE events show wave-like increases. The cracks first appear at the location with dense defects, and the cracks initiate from the top and bottom of the circular holes. The crack propagation and intersection modes between two adjacent defects are affected by their positions. These findings provide a reference for the fracture mechanism of rock with random circular defects.

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Failure characteristics of rock-like materials with single flaws under uniaxial compression

Cited by 63 publications

References 44 publications

Cracking Behavior and Acoustic Emission Characteristics of Rock Containing a Single Preexisting Flaw

Cracking Behavior and Acoustic Emission Characteristics of Rock Containing a Single Preexisting Flaw

Mode I Fracture Toughness Test and Fractal Character of Fracture Trajectory of Red Sandstone under Real-Time High Temperature

Mechanical and cracking behavior of porous rock models containing random circular defects under uniaxial compression

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